Abstract
The Batié granitic massif in western Cameroon is NE-SW elongated, following the regional foliation and parallel to the Kekem-Fotouni shear zone, south-western extension of the Tcholliré-Banyo Fault (TBF). This massif comprises two petrographic units: biotite granite and amphibole granite. Major, trace, REE, Sr-Nd isotopic and new U-Pb data, are used to constrain their nature and origin. The results indicate that they are high-K alkali- calcic with shoshonite affinity. The amphibole granite is metaluminous, whereas biotite granite is weakly peraluminous. Both granites are high temperature I-type granites and crystallized under oxidizing conditions. Initial (87Sr/86Sr)620Ma ratios (0.706-0.708) and εNd620Ma (-12.58 to -8.89) indicate the parental magmas were produced by partial melting of deep old Paleoproterozoic crust and were mixed with felsic magma from upper continental crust. Their TDM typically vary from 1.68 to 1.96 Ga. The massif was mostly emplaced between 630 and 547 Ma; during the transitional period between the crustal thickening (ca. 630-620 Ma) and the development of the shear zones, which began with sinistral movements (613-585 Ma) and continued with dextral movements (585-540 Ma). Plutonism continued during the dextral movements. The Batié granite is geochemically and isotopically similar to other post-collisional pan-African granitic massifs located along TBF.
Highlights
The Pan-African domain of Western Central Cameroon shows many plutonic massifs emplaced following the extensive remobilization and granitization during the collision between the São Francisco–Congo and West African cratons and the Saharan metacraton at 640–580 Ma (Liégeois et al, 1998; Abdelsalam et al, 2002; Ngako et al, 2008)
We focus on the Batié magmatic complex, along with a large number of similar Pan-African granitoids, emplaced along the Tcholliré–Banyo Fault (TBF) that separates the Central from the Northern domain
Our results show that the partial melting of materials of mixed origin at the continental crust during the Pan-African orogeny would be a plausible process in the formation of Batié granite
Summary
The Pan-African domain of Western Central Cameroon shows many plutonic massifs emplaced following the extensive remobilization and granitization during the collision between the São Francisco–Congo and West African cratons and the Saharan metacraton at 640–580 Ma (Liégeois et al, 1998; Abdelsalam et al, 2002; Ngako et al, 2008). The elongated NE–SW Batié plutonic massif outcrops at the southern edge of the Kekem–Fotouni shear zone, which is the southwestern extension of the Tcholliré–Banyo Fault (TBF). Along this shear zone and on either side, several granitic massifs were studied. They are mainly I- or S-type, which are high-K calcalkaline granites emplaced between 680 and 580 Ma (Nzolang et al, 2003; Tagne-Kamga, 2003; Toteu et al, 2004; Tchameni et al, 2006; Djouka-Fonkwé et al, 2008; Kwékam et al, 2010, 2013, 2020)
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